Which force keeps the planets from floating off into space? O Earth's gravity
O the Sun's gravity
O the moon's gravity
O Milky Way's gravity

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.

Stages 1 and 4 of the demographic transition are similar in that

Who developed the theory of plate tectonics?